Microhabitat preference and trophic guilds of aquatic macroinvertebrates in high Andean rivers, Ayacucho, Peru Studies of aquatic macroinvertebrates in high-altitude rivers in the Andes are scarce, and little is known about the trophic role that these organisms play in these ecosystems. In the present work, the microhabitat preference of the aquatic macroinvertebrate community was studied and its trophic guilds was described through the analysis of stomach contents in two high Andean rivers of Peru. Significant differences (p < 0.05) were found between abundance, richness, Pielou equity index and effective number of species between the microhabitats studied in both rivers. The highest values of wealth in both rivers were found in the medium stone microhabitat, being the most abundant and diverse the members of the Diptera order. The lowest values of richness were found in the rock microhabitat. Four food items were identified: fine particulate organic matter (MOPF), microalgae (MA), animal remains (RA) and vegetable tissue (TV), of which MOPF was the predominant one in almost all the organisms analyzed, which shows that MOPF is the main food item consumed in both rivers. Spatially, it was the detritivores and herbivores that were in great proportion in almost all the microhabitats in both high Andean rivers.
{"title":"Preferencia de microhábitat y gremios tróficos de macroinvertebrados acuáticos en ríos altoandinos, Ayacucho, Perú","authors":"Manuel A. Silva Poma, A. A. Huamantinco Araujo","doi":"10.23818/limn.41.01","DOIUrl":"https://doi.org/10.23818/limn.41.01","url":null,"abstract":"Microhabitat preference and trophic guilds of aquatic macroinvertebrates in high Andean rivers, Ayacucho, Peru Studies of aquatic macroinvertebrates in high-altitude rivers in the Andes are scarce, and little is known about the trophic role that these organisms play in these ecosystems. In the present work, the microhabitat preference of the aquatic macroinvertebrate community was studied and its trophic guilds was described through the analysis of stomach contents in two high Andean rivers of Peru. Significant differences (p < 0.05) were found between abundance, richness, Pielou equity index and effective number of species between the microhabitats studied in both rivers. The highest values of wealth in both rivers were found in the medium stone microhabitat, being the most abundant and diverse the members of the Diptera order. The lowest values of richness were found in the rock microhabitat. Four food items were identified: fine particulate organic matter (MOPF), microalgae (MA), animal remains (RA) and vegetable tissue (TV), of which MOPF was the predominant one in almost all the organisms analyzed, which shows that MOPF is the main food item consumed in both rivers. Spatially, it was the detritivores and herbivores that were in great proportion in almost all the microhabitats in both high Andean rivers.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43987043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Guilherme Diagonel, Orlando Aparecido Carriel, R. Oliveira, L. K. Vilas Boas, Ciro Cesar Zanini Branco
Effect of glyphosate-based herbicides on the photosynthetic responses of the macrophyte Egeria densa Planch. from topical lotic ecosystems The effects of pesticide pollution on eco-physiological responses in primary producers are understudied. To partly overcome this gap, this study evaluated the effects of a glyphosate-based herbicide, Roundup® (three nominal concentrations: 0.28 mg/L [Treatment T0.28]; 3.5 mg/L [T3.5]; and 6 mg/L [T6]), and its main degradation product, aminomethylphosphonic acid (AMPA) (0.03 mg/L [T0.03]), on the photosynthetic responses of an aquatic macrophyte species, Egeria densa Planch. The net photosynthetic rate (NPR) and dark respiration rate (DRR) were evaluated by the dissolved oxygen evolution method, while some PSII performance parameters were measured by a Chl-a fluorescence-based method. Additionally, the chlorophyll a content was measured. The experimental data showed that E. densa had significant losses in photosynthetic efficiency under Roundup® and AMPA exposure, with reductions in the NPR (reduction of -61 % for T3.5; –90 % for T6; and –161 % for T0.03, compared to control) and chlorophyll a content (–82 % for T0.28, –79 % for T3.5, –82 % for T6, and –28 % for T0.03) and increases in the DRR (+150 % for T3.5, +130 % for T6, and +271 % for T0.03). The results from the Chla fluorescence measurements registered statistically significant differences between the Roundup® treatments and the control group for the effective quantum yield (+56 % for T0.28, +43 % for T3.5, and +56 % for T6) and for non-photochemical extinction (+67% for T0.28, +73 % for T3.5, and +59 % for T6). Taken together, the findings of the experiments with E. densa indicate that the negative effects from the glyphosate-based herbicide Roundup® on primary producers might be common and widespread in tropical and subtropical aquatic environments in Brazil.
{"title":"Effect of glyphosate-based herbicides on the photosynthetic responses of the macrophyte Egeria densa Planch. from topical lotic ecosystems","authors":"Guilherme Diagonel, Orlando Aparecido Carriel, R. Oliveira, L. K. Vilas Boas, Ciro Cesar Zanini Branco","doi":"10.23818/limn.41.06","DOIUrl":"https://doi.org/10.23818/limn.41.06","url":null,"abstract":"Effect of glyphosate-based herbicides on the photosynthetic responses of the macrophyte Egeria densa Planch. from topical lotic ecosystems The effects of pesticide pollution on eco-physiological responses in primary producers are understudied. To partly overcome this gap, this study evaluated the effects of a glyphosate-based herbicide, Roundup® (three nominal concentrations: 0.28 mg/L [Treatment T0.28]; 3.5 mg/L [T3.5]; and 6 mg/L [T6]), and its main degradation product, aminomethylphosphonic acid (AMPA) (0.03 mg/L [T0.03]), on the photosynthetic responses of an aquatic macrophyte species, Egeria densa Planch. The net photosynthetic rate (NPR) and dark respiration rate (DRR) were evaluated by the dissolved oxygen evolution method, while some PSII performance parameters were measured by a Chl-a fluorescence-based method. Additionally, the chlorophyll a content was measured. The experimental data showed that E. densa had significant losses in photosynthetic efficiency under Roundup® and AMPA exposure, with reductions in the NPR (reduction of -61 % for T3.5; –90 % for T6; and –161 % for T0.03, compared to control) and chlorophyll a content (–82 % for T0.28, –79 % for T3.5, –82 % for T6, and –28 % for T0.03) and increases in the DRR (+150 % for T3.5, +130 % for T6, and +271 % for T0.03). The results from the Chla fluorescence measurements registered statistically significant differences between the Roundup® treatments and the control group for the effective quantum yield (+56 % for T0.28, +43 % for T3.5, and +56 % for T6) and for non-photochemical extinction (+67% for T0.28, +73 % for T3.5, and +59 % for T6). Taken together, the findings of the experiments with E. densa indicate that the negative effects from the glyphosate-based herbicide Roundup® on primary producers might be common and widespread in tropical and subtropical aquatic environments in Brazil.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48654258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Montes-Pérez, B. Obrador, T. Conejo-Orosa, V. Rodríguez, R. Marcé, C. Escot, I. Reyes, J. Rodríguez, E. Moreno-Ostos
Spatio-temporal variability of carbon dioxide and methane emissions from a Mediterranean Reservoir Freshwater reservoirs constitute a significant source of carbon dioxide (CO2) and methane (CH4) to the atmosphere, and a precise quantification of the magnitude of these greenhouse gas emission on an annual scale is required. This quantification must consider both temporal and spatial variability of reservoir carbon gas fluxes. In addition, it is relevant to reinforce research focusing on the emission of CO2 and CH4 in Mediterranean reservoirs. Here, we simultaneously measured CO2 fluxes and CH4 ebullitive and diffusive emissions in the riverine and lacustrine zones of a Mediterranean reservoir (El Gergal, Spain) throughout a complete year to quantify their magnitude, explore their spatial and temporal variability, and investigate the potential limnological and hydrological factors influencing gases emissions. Our results show that during the study year El Gergal riverine zone was a CO2 sink, while the lacustrine zone was a CO2 source. In addition, both areas were CH4 sources to the atmosphere. CO2 and CH4 fluxes in El Gergal showed a marked temporal variability, with significant differences between mixing and thermally stratified periods. CO2 emissions were significantly influenced by surface chlorophyll-a concentration and pH, suggesting the prevalent role of primary production as CO2 flux driver. CH4 emissions were influenced by hypolimnetic methane concentration and hydrological factors potentially affected by climate change, such as water renewal rate and
{"title":"Spatio-temporal variability of carbon dioxide and methane emissions from a Mediterranean reservoir","authors":"J. Montes-Pérez, B. Obrador, T. Conejo-Orosa, V. Rodríguez, R. Marcé, C. Escot, I. Reyes, J. Rodríguez, E. Moreno-Ostos","doi":"10.23818/limn.41.04","DOIUrl":"https://doi.org/10.23818/limn.41.04","url":null,"abstract":"Spatio-temporal variability of carbon dioxide and methane emissions from a Mediterranean Reservoir Freshwater reservoirs constitute a significant source of carbon dioxide (CO2) and methane (CH4) to the atmosphere, and a precise quantification of the magnitude of these greenhouse gas emission on an annual scale is required. This quantification must consider both temporal and spatial variability of reservoir carbon gas fluxes. In addition, it is relevant to reinforce research focusing on the emission of CO2 and CH4 in Mediterranean reservoirs. Here, we simultaneously measured CO2 fluxes and CH4 ebullitive and diffusive emissions in the riverine and lacustrine zones of a Mediterranean reservoir (El Gergal, Spain) throughout a complete year to quantify their magnitude, explore their spatial and temporal variability, and investigate the potential limnological and hydrological factors influencing gases emissions. Our results show that during the study year El Gergal riverine zone was a CO2 sink, while the lacustrine zone was a CO2 source. In addition, both areas were CH4 sources to the atmosphere. CO2 and CH4 fluxes in El Gergal showed a marked temporal variability, with significant differences between mixing and thermally stratified periods. CO2 emissions were significantly influenced by surface chlorophyll-a concentration and pH, suggesting the prevalent role of primary production as CO2 flux driver. CH4 emissions were influenced by hypolimnetic methane concentration and hydrological factors potentially affected by climate change, such as water renewal rate and","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49221391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The influence of hydrology and sediment grain-size on the spatial distribution of macroinvertebrate communities in two submerged dunes from the Danube Delta (Romania) The present study focused on the ecological preferences of benthic macroinvertebrates regarding water flow and sediment characteristics in two submerged dunes from Danube Delta (Romania). Three hydraulic microhabitats, the stoss, trough and crest areas were sampled, along with measurements of water hydraulics, hydrology, sediment grain-size, and organic content. The results showed that the slope angles between stoss-crest and crest-trough areas are crucial in modulating local flows, sediment structure, organic content, macroinvertebrate communities, and taxonomic richness and density. As such, the stoss microhabitats are considered zones with the highest turbulence, hence driving low taxonomic richness and density compared to crest and trough microhabitats. When local environmental conditions in trough microhabitats allow the accretion of fine and organically enriched sediments, the development of maximum density for certain macroinvertebrates groups is reached. However, the benthic assemblages did not show clear preferences for certain microhabitats, suggesting ubiquitous ecologic traits, crucial for the successful colonisation of dynamic habitats, such as the submerged dunes in large rivers. The results of this study offer a better understanding on the abiotic factors driving the spatial preferences, density, and diversity of benthic macroinvertebrates in these understudied hydrogeomorphological units from large rivers.
{"title":"The influence of hydrology and sediment grain-size on the spatial distribution of macroinvertebrate communities in two submerged dunes from the Danube Delta (Romania)","authors":"O. Pacioglu, F. Duţu, A. Pavel, Laura Tiron Duţu","doi":"10.23818/limn.41.07","DOIUrl":"https://doi.org/10.23818/limn.41.07","url":null,"abstract":"The influence of hydrology and sediment grain-size on the spatial distribution of macroinvertebrate communities in two submerged dunes from the Danube Delta (Romania) The present study focused on the ecological preferences of benthic macroinvertebrates regarding water flow and sediment characteristics in two submerged dunes from Danube Delta (Romania). Three hydraulic microhabitats, the stoss, trough and crest areas were sampled, along with measurements of water hydraulics, hydrology, sediment grain-size, and organic content. The results showed that the slope angles between stoss-crest and crest-trough areas are crucial in modulating local flows, sediment structure, organic content, macroinvertebrate communities, and taxonomic richness and density. As such, the stoss microhabitats are considered zones with the highest turbulence, hence driving low taxonomic richness and density compared to crest and trough microhabitats. When local environmental conditions in trough microhabitats allow the accretion of fine and organically enriched sediments, the development of maximum density for certain macroinvertebrates groups is reached. However, the benthic assemblages did not show clear preferences for certain microhabitats, suggesting ubiquitous ecologic traits, crucial for the successful colonisation of dynamic habitats, such as the submerged dunes in large rivers. The results of this study offer a better understanding on the abiotic factors driving the spatial preferences, density, and diversity of benthic macroinvertebrates in these understudied hydrogeomorphological units from large rivers.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47420731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The relevance of pelagic calcification in the global carbon budget of lakes and reservoirs Calcite precipitation acts as a carbon sink in the sediments and a short-term source of carbon dioxide (CO2) to the atmosphere, as widely acknowledged in marine studies. However, pelagic calcite precipitation has received limited attention in lakes. Here we use the relationship between lake water alkalinity and reported calcification rates to provide the first global estimate of pelagic calcification in lakes. Global gross calcification rates amount to 0.03 Pg C yr-1 (0.01 – 0.07) comparable to rates of organic carbon burial, whereas its related CO2 release is largely buffered by the carbonate equilibria. Calcification occurs at water alkalinity above 1 meq/L corresponding to 57 % of global lake and reservoir surface area. Pelagic calcification therefore is a prevalent process in lakes and reservoirs at the global scale, with a potentially relevant role as a sedimentary inorganic carbon sink, comparable in magnitude to the total calcite accumulation rates in ocean sediments.
远洋钙化在湖泊和水库全球碳收支中的相关性正如海洋研究中广泛承认的那样，方解石沉淀是沉积物中的碳汇和大气中二氧化碳的短期来源。然而，湖泊中的远洋方解石沉淀受到的关注有限。在这里，我们利用湖水碱度和报告的钙化率之间的关系，首次对湖泊中的浮游钙化进行了全球估计。全球总钙化率为0.03 Pg C yr-1（0.01–0.07），与有机碳埋藏率相当，而其相关的CO2释放在很大程度上受到碳酸盐平衡的缓冲。钙化发生在水碱度高于1meq/L时，相当于全球湖泊和水库表面积的57%。因此，远洋钙化是全球范围内湖泊和水库中普遍存在的过程，作为沉积无机碳汇具有潜在的相关作用，其规模与海洋沉积物中的总方解石积累率相当。
{"title":"The relevance of pelagic calcification in the global carbon budget of lakes and reservoirs","authors":"Hares Khan, R. Marcé, A. Laas, B. Obrador","doi":"10.23818/limn.41.02","DOIUrl":"https://doi.org/10.23818/limn.41.02","url":null,"abstract":"The relevance of pelagic calcification in the global carbon budget of lakes and reservoirs Calcite precipitation acts as a carbon sink in the sediments and a short-term source of carbon dioxide (CO2) to the atmosphere, as widely acknowledged in marine studies. However, pelagic calcite precipitation has received limited attention in lakes. Here we use the relationship between lake water alkalinity and reported calcification rates to provide the first global estimate of pelagic calcification in lakes. Global gross calcification rates amount to 0.03 Pg C yr-1 (0.01 – 0.07) comparable to rates of organic carbon burial, whereas its related CO2 release is largely buffered by the carbonate equilibria. Calcification occurs at water alkalinity above 1 meq/L corresponding to 57 % of global lake and reservoir surface area. Pelagic calcification therefore is a prevalent process in lakes and reservoirs at the global scale, with a potentially relevant role as a sedimentary inorganic carbon sink, comparable in magnitude to the total calcite accumulation rates in ocean sediments.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48110874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Daniele Debiasi, A. Franceschini, F. Paoli, V. Lencioni
How do macroinvertebrate communities respond to declining glacial influence in the Southern Alps? In the summer of 2018, we compared the macroinvertebrate communities of four streams fed by retreating glaciers and of one pro-glacial pond in the Italian Alps. The general aim was to determine if habitats fed by glaciers with different surface areas host different communities along a longitudinal gradient and to identify which environmental variables can predict these differences. Eight sampling sites were selected with different glacial influences given by the Glacial Index (GI, range 0-1). This index takes into consideration the distance from the snout and glacier surface area. Five were classified as kryal, fed mainly by ice melt and lay within 1 km of the snout; two as glacio-rhithral, with mixed contributions and > 1 km from the snout; and one as a pro-glacial pond, which lays within 50 m from the snout and was fed by ice melt. Chironomids were the most frequent (100 %) and abundant taxa (80 %), followed by EPT (Ephemeroptera, Plecoptera, Trichoptera) which represented 9 % of total abundance. All kryal sites (MA1, CR0, CR1, AG1) were dominated by chironomids (> 98 %), except for C0, which hosts a community resembling that of glacio-rhithral sites (C2, CR2), which are more diversified and have approximately 60 % of their communities composed of chironomids. While C0 is fed mainly by ice-melt, its GI was lower (0.3) than that of the other kryal sites (0.5-1.0) because of the small size of the feeding glacier (0.14 ha). These results emphasise that the glacier surface area affects the benthic fauna and that the GI should be considered when classifying different types of sites. GI was also selected as one of the best predictors of faunal changes by distance-based redundancy analysis (dbRDA), which was performed to investigate the relationships between taxa distribution and environmental conditions, along with the values of maximum water temperature and chlorophyll a concentration. Overall, this study provides new insights into how different glacial influences affect the macroinvertebrate communities of freshwater habitats.
{"title":"How do macroinvertebrate communities respond to declining glacial influence in the Southern Alps?","authors":"Daniele Debiasi, A. Franceschini, F. Paoli, V. Lencioni","doi":"10.23818/limn.41.10","DOIUrl":"https://doi.org/10.23818/limn.41.10","url":null,"abstract":"How do macroinvertebrate communities respond to declining glacial influence in the Southern Alps? In the summer of 2018, we compared the macroinvertebrate communities of four streams fed by retreating glaciers and of one pro-glacial pond in the Italian Alps. The general aim was to determine if habitats fed by glaciers with different surface areas host different communities along a longitudinal gradient and to identify which environmental variables can predict these differences. Eight sampling sites were selected with different glacial influences given by the Glacial Index (GI, range 0-1). This index takes into consideration the distance from the snout and glacier surface area. Five were classified as kryal, fed mainly by ice melt and lay within 1 km of the snout; two as glacio-rhithral, with mixed contributions and > 1 km from the snout; and one as a pro-glacial pond, which lays within 50 m from the snout and was fed by ice melt. Chironomids were the most frequent (100 %) and abundant taxa (80 %), followed by EPT (Ephemeroptera, Plecoptera, Trichoptera) which represented 9 % of total abundance. All kryal sites (MA1, CR0, CR1, AG1) were dominated by chironomids (> 98 %), except for C0, which hosts a community resembling that of glacio-rhithral sites (C2, CR2), which are more diversified and have approximately 60 % of their communities composed of chironomids. While C0 is fed mainly by ice-melt, its GI was lower (0.3) than that of the other kryal sites (0.5-1.0) because of the small size of the feeding glacier (0.14 ha). These results emphasise that the glacier surface area affects the benthic fauna and that the GI should be considered when classifying different types of sites. GI was also selected as one of the best predictors of faunal changes by distance-based redundancy analysis (dbRDA), which was performed to investigate the relationships between taxa distribution and environmental conditions, along with the values of maximum water temperature and chlorophyll a concentration. Overall, this study provides new insights into how different glacial influences affect the macroinvertebrate communities of freshwater habitats.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42376874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. J. Pozzo-Pirotta, J. Montes-Pérez, S. Sammartino, R. Marcé, B. Obrador, C. Escot, I. Reyes, E. Moreno-Ostos
Carbon dioxide emission from drawdown areas of a Mediterranean reservoir Sediment beds from drawdown areas of reservoirs constitute a relevant hotspot for carbon dioxide (CO2) emission to the atmosphere. This CO2 source is especially relevant in the case of Mediterranean reservoirs, where hydrological variability favors the exposure of large sediment areas to air. In spite of this, the role of dry sediments as CO2 emitters has been typically neglected in lakes and reservoirs greenhouse gas emission assessments, and there is also a lack of research on the spatial variability of CO2 fluxes from drawdown sediments. In this study we contribute to this knowledge by combining drone-based aero-photogrammetry techniques with in situ infrarred gas analyzer measurements to assess the magnitude and spatial variability of CO2 fluxes from the drawdown area of a Mediterranean reservoir (El Gergal, Southwestern Spain) during one dry season. Our results show that during survey dry sediments in El Gergal were a relevant net CO2 source to the atmosphere, with a mean emission of 0.36 ± 0.38 g CO2 m-2 h-1. In addition, CO2 fluxes from El Gergal drawdown depict a marked spatial variability, with maximum values measured in areas influenced by river or intermittent streams discharges. Distance to the shore, sediment particle size, pH and temperature also have a significant effect on CO2 emissions from the reservoir dry banks. The expected strengthening of droughts intensity and frequency in the Mediterranean region could enhance the role of exposed sediments from the drawdown of reservoirs as CO2 source to the atmosphere.
地中海水库水位下降区域的二氧化碳排放水库水位下降区的沉积物床是向大气排放二氧化碳的相关热点。这种二氧化碳来源在地中海水库的情况下尤其重要，那里的水文变化有利于大型沉积物区域暴露在空气中。尽管如此，在湖泊和水库的温室气体排放评估中，干沉积物作为二氧化碳排放者的作用通常被忽视，而且也缺乏对下降沉积物中二氧化碳通量的空间变异性的研究。在这项研究中，我们将基于无人机的航空摄影测量技术与现场红外气体分析仪测量相结合，以评估一个旱季地中海水库（西班牙西南部El Gergal）水位下降区二氧化碳通量的大小和空间变异性，从而为这一知识做出贡献。我们的结果表明，在调查过程中，El Gergal的干燥沉积物是大气中相关的净CO2源，平均排放量为0.36±0.38 g CO2 m-2 h-1。此外，El Gergal水位下降产生的CO2通量具有显著的空间变异性，在受河流或间歇性溪流排放影响的地区测得的最大值。到海岸的距离、沉积物颗粒大小、pH值和温度也对水库干岸的CO2排放有显著影响。地中海地区干旱强度和频率的预期增强可能会增强水库水位下降后暴露的沉积物作为大气中二氧化碳来源的作用。
{"title":"Carbon dioxide emission from drawdown areas of a Mediterranean reservoir","authors":"L. J. Pozzo-Pirotta, J. Montes-Pérez, S. Sammartino, R. Marcé, B. Obrador, C. Escot, I. Reyes, E. Moreno-Ostos","doi":"10.23818/limn.41.05","DOIUrl":"https://doi.org/10.23818/limn.41.05","url":null,"abstract":"Carbon dioxide emission from drawdown areas of a Mediterranean reservoir Sediment beds from drawdown areas of reservoirs constitute a relevant hotspot for carbon dioxide (CO2) emission to the atmosphere. This CO2 source is especially relevant in the case of Mediterranean reservoirs, where hydrological variability favors the exposure of large sediment areas to air. In spite of this, the role of dry sediments as CO2 emitters has been typically neglected in lakes and reservoirs greenhouse gas emission assessments, and there is also a lack of research on the spatial variability of CO2 fluxes from drawdown sediments. In this study we contribute to this knowledge by combining drone-based aero-photogrammetry techniques with in situ infrarred gas analyzer measurements to assess the magnitude and spatial variability of CO2 fluxes from the drawdown area of a Mediterranean reservoir (El Gergal, Southwestern Spain) during one dry season. Our results show that during survey dry sediments in El Gergal were a relevant net CO2 source to the atmosphere, with a mean emission of 0.36 ± 0.38 g CO2 m-2 h-1. In addition, CO2 fluxes from El Gergal drawdown depict a marked spatial variability, with maximum values measured in areas influenced by river or intermittent streams discharges. Distance to the shore, sediment particle size, pH and temperature also have a significant effect on CO2 emissions from the reservoir dry banks. The expected strengthening of droughts intensity and frequency in the Mediterranean region could enhance the role of exposed sediments from the drawdown of reservoirs as CO2 source to the atmosphere.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45018182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Natalí Romero, Andrés M. Attademo, U. Reno, L. Regaldo, M. Repetti, R. Lajmanovich, A. Gagneten
Analysis of the zooplanktonic community in rice fields during a crop cycle in agroecological versus conventional
作物周期内稻田浮游动物群落的农业生态学与传统生态学分析
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Adrián Guerrero-Gómez, A. Zamora-López, Antonio Guillén-Beltrán, J. M. Zamora-Marín, Ana Sánchez-Pérez, M. Torralva, F. J. Oliva-Paterna
An updated checklist of YOY fish in shallow areas of the Mar Menor (Western Mediterranean) The Mar Menor is one of the largest coastal lagoons in the Mediterranean basin. This study provides an updated checklist of the fish species inhabiting its shallow areas as young of the year in the period 2018-2019. A total of 43 taxa in 19 families were detected. This information should be useful to establish environmental monitoring programmes, as well as the implementation of management actions.
Mar Menor（西地中海）浅水区YOY鱼的最新清单Mar Meno是地中海盆地最大的沿海泻湖之一。这项研究提供了2018-2019年期间栖息在浅水区的最新鱼类清单。共检测到19科43个分类群。这些信息应有助于制定环境监测方案以及实施管理行动。
{"title":"An updated checklist of YOY fish occurrence in the shallow perimetral areas of the Mar Menor (Western Mediterranean Sea)","authors":"Adrián Guerrero-Gómez, A. Zamora-López, Antonio Guillén-Beltrán, J. M. Zamora-Marín, Ana Sánchez-Pérez, M. Torralva, F. J. Oliva-Paterna","doi":"10.23818/limn.41.08","DOIUrl":"https://doi.org/10.23818/limn.41.08","url":null,"abstract":"An updated checklist of YOY fish in shallow areas of the Mar Menor (Western Mediterranean) The Mar Menor is one of the largest coastal lagoons in the Mediterranean basin. This study provides an updated checklist of the fish species inhabiting its shallow areas as young of the year in the period 2018-2019. A total of 43 taxa in 19 families were detected. This information should be useful to establish environmental monitoring programmes, as well as the implementation of management actions.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46969492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Periphyton can contribute to maintaining oligotrophic conditions in restored shallow lakes and reservoirs. In two mesocosm experiments, we evaluated the periphyton responses to enrichment and nutrient dilution in a hypereutrophic reservoir. Effects of the isolated and combined N and P enrichment and dilution levels on periphyton biomass and structure on artificial substrate were investigated. For colonization of periphyton, glass slides were exposed for 14 days (enrichment experiment) and 21 days (dilution experiment) at 20 cm deep. We monitored the effects of N and P enrichment and dilution on the algal biomass, density, and species composition in the periphyton. P was a primary limiting factor for periphyton development. Periphyton algal density and biomass increased in response to combined and isolated P enrichment. Only the 75 % dilution had a positive and significant effect on biomass and algal density in the periphyton. In both mesocosm experiments, the periphyton structure changed, with Nitzschia palea (Kutz.) Smith responding positively to P enrichment and negatively to dilution. Achnanthidium minutissimum Complex becoming dominant following 50 % and 75 % eutrophic water dilution. Our results suggest that major environmental changes are necessary for a heterogeneous algal community structure in the periphyton in hypereutrophic con¬ditions. We conclude that, after a restoration process that reduces P-competition with phytoplankton and shading, periphyton can become an important primary producer in a hypereutrophic reservoir.
{"title":"Periphyton responses to enrichment and nutrient dilution in two mesocosm experiments in a shallow hypereutrophic reservoir","authors":"Ruan de Oliveira Carneiro, C. Ferragut","doi":"10.23818/limn.42.06","DOIUrl":"https://doi.org/10.23818/limn.42.06","url":null,"abstract":"Periphyton can contribute to maintaining oligotrophic conditions in restored shallow lakes and reservoirs. In two mesocosm experiments, we evaluated the periphyton responses to enrichment and nutrient dilution in a hypereutrophic reservoir. Effects of the isolated and combined N and P enrichment and dilution levels on periphyton biomass and structure on artificial substrate were investigated. For colonization of periphyton, glass slides were exposed for 14 days (enrichment experiment) and 21 days (dilution experiment) at 20 cm deep. We monitored the effects of N and P enrichment and dilution on the algal biomass, density, and species composition in the periphyton. P was a primary limiting factor for periphyton development. Periphyton algal density and biomass increased in response to combined and isolated P enrichment. Only the 75 % dilution had a positive and significant effect on biomass and algal density in the periphyton. In both mesocosm experiments, the periphyton structure changed, with Nitzschia palea (Kutz.) Smith responding positively to P enrichment and negatively to dilution. Achnanthidium minutissimum Complex becoming dominant following 50 % and 75 % eutrophic water dilution. Our results suggest that major environmental changes are necessary for a heterogeneous algal community structure in the periphyton in hypereutrophic con¬ditions. We conclude that, after a restoration process that reduces P-competition with phytoplankton and shading, periphyton can become an important primary producer in a hypereutrophic reservoir.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"46 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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